Heating unit for fireplaces



J. 10, 1939. G. HANNULA HEATING UNIT FOR FIREPLACES Filed May 17, 1958 2 Sheets-Sheet l awe/14M Jan. 10, 1939. ANN A 2,143,772

x; I 1 I v r l I HEATING UNIAT FOR FIREPLACES Filed May 1?; 1938 2 Sheets-Sheet 2 aus zfiannuza Patented Jan. 10, 1939 UNITED STATES 6 Claims.

This invention relates to a heating unit for use in fireplaces.

One of its objects is the utilization of heat produced'by fuel in the commonly used fireplace by providing a unit to control said heat not heretofore in use.

Another object is to provide a structure which will permit a variation in the flow of the hot gases of combustion circulating through the unit so as to enable the distribution of heat wherever desired.

A further object of the invention is to provide a unit simple and compact in construction and which may be installed so as to be almost wholly concealed in the fireplace opening.

With these and other objects in view, which will appear hereinafter, I have illustrated and described a preferred embodiment of my invention in which:-

Figure 1 is a perspective view of the complete unit ready for installation in a fireplace.

Figure 2 is a rear elevation of the unit.

Figure 3 is a bottom view looking upwardly from that portion of the unit resting on the floor.

Figure 4 is a vertical sectional view taken on the line A-A of Figure 2.

Figure 5 is a detail view of the casing section showing more clearly the means of attaching the damper thereto.

The invention as illustrated in Figure 1 embodies a casing A made of any suitable material and forming a heat chamber I. Mounted in the heat chamber is shown a heat utilization unit or pipe 2 which pipe is preferably shaped in the form shown in Figure 2. The ends of the pipe comprising the air intake portions terminate in openings 3 formed in the curved front section 4 of the casing A. A discharge end 5 forming a part of the pipe 2 extends upwardly from the casing A, as may be noted in Figure 2, and enters a chimney, not shown.

The pipe 2 is provided with an opening at its lower portion, which opening is normally closed by means of a sliding clean out plate 6. Normally mounted on the casing A and suitably secured by means of a hinge spring or other simple fastening element is a door or closure member I. This door is positioned so as to permit ready access to the sliding plate 6 thereby permitting quick and efficient removal of ashes and other Waste matter from the pipe 2. It is obvious that any waste material accumulating in the heat chamber I may be removed through the door 1 in the same manner.

One of the features of the invention is the simple and practical means provided for the piping of heat to any desired location. This means is more clearly shown in Figure 1, in which 8 are air inlets or passages leading into the heat chamber I, preferably at the lower side portions of the casing A. Heat outlets 9 are provided in the upper side portions of the casing A to which may be joined pipes through which heat passes to whatever point needed.

The air inlets or passages 8 and the outlets 9 may be enlarged in size and number if found necessary. The location of these members furthermore, may be shifted without destroying the efiicient operation of the heating unit.

Referring now to the casing A, it will be seen that the upper portion H] is extended outwardly and is provided with a damper member I l mounted thereon. This damper H is secured to the casing portion ID by means of plates 12, as shown in Figure 1. Operation of the damper Ii may be performed through movement of a handle l3 which passes through an opening in the casing portion I 0.

The discharge end 5 of the pipe 2 is also provided with a damper member M, as shown in Figure 2, which damper may be adjusted to any position by movement of the connected lever rods l 5, I6 and IT. These rods are held in place by the plate l8 mounted on top of the casing A. The rod I1 terminates in a handle or lever member I!) passing through an opening in the casing portion Hi, the position of this handle permitting instant and accurate adjustment of the damper member M.

In the installation of the complete unit in a fireplace, it is inserted or placed therein after which the entire unit is enclosed in masonry, leaving openings at 8 and 9 accessible to piping and also permitting the front section 4 of the casing A exposed to view. As a matter of fact, it is desirable that this last mentioned member be the only part exposed.

The front of the fireplace is also enclosed by masonry or the like so as to form a smoke chamber above the unit, but at the same time allowing for free use of the damper members II and i l and for the passage of smoke through the damper H to the chimney. The chimney is constructed suitably larger than the discharge end 5 of the pipe 2' in order to create the necessary draft.

It is believed apparent that movement of the damper members I I and I4 will vary the air circulation through the heat unit.

In the event humidification is found necessary,

such may be obtained by the insertion of a water filled receptacle into the openings or passages 8.

It will be understood that the invention is not restricted to the form illustrated or described but may be extended and changed in accordance with the scope of the following claims.

I claim:-

1. A heating unit for fireplaces embodying a casing, a heat chamber enclosed in said casing, a pipe positioned within said chamber, openings provided in the front of said casing to permit circulation of hot gases of combustion through said pipe, a damper element situated adjacent the openings to vary the flow of said gases through said pipe, and air intake passages located in the sides of said casing to permit circulation of air in said heat chamber.

2. A multiple heat circulating unit for fireplaces comprising a casing, a heat chamber enclosed in said casing, said heat chamber containing a circulating element for the hot gases of combustion formed with intake openings disposed in the front of said casing and. an outlet opening extending through said casing, a damper element situated adjacent the intake openings to vary the flow of said gases, and air intake passages located in the sides of said casing to permit circulation of air through said heat chamber.

3. A multiple heat circulating unit for fireplaces comprising a casing and a heating chamber containing a pipe for circulating the hot gases of combustion therethrough, intake openings provided in the front of said casing, and a damper controlled outlet for said pipe extending upwardly of said casing, air intake passages located in the sides of said casing to permit circulation of air through said heat chamber and heat outlet openings provided in said casing at the sides thereof.

4. A multiple heat circulating unit comprising a casing and a heating chamber, said heating chamber having a pipe therein through which the hot gases of combustion are intended to circulate,

intake openings provided in the front of said casing, said casing being extended adjacent said openings, said extension being provided with a damper controlled passage to vary the circulation of the gases through said intake openings, air inlet and outlet passages arranged at the sides of said casing and a sliding plate mounted in said heating chamber beneath said circulating pipe to permit removal of waste therefrom.

5. A multiple heat circulating unit comprising a casing having a heating chamber therein, a circulating pipe for the hot gases of combustion disposed in said heating chamber, intake and outlet openings in the front and back of said casing to permit the hot gases to circulate through said pipe, a damper controlled opening arranged near the front top of said casing and adjacent the intake openings to vary the flow therethrough, passages arranged at the sides of said casing to permit circulation of air in the heating chamber, a sliding 'plate positioned beneath said pipe to permit removal of waste therefrom, and a door opening in the rear of said casing adjacent said sliding plate.

6. A multiple heat circulating unit comprising a casing having a heating chamber therein, a circulating pipe for the hot gases of combustion disposed in said heating chamber, intake and outlet openings in the front and back of said casing to permit the gases to circulate through said pipe, a damper in said pipe controlling said outlet opening, a damper controlled opening in the casing adjacent the intake openings to vary the flow therethrough, inlet and outlet openings provided in the sides of said casing to permit entrance of cold air and outlet of heated air toand from said heating chamber and a sliding plate mounted beneath said air circulating pipe to permit removal of waste therefrom and a door opening provided at the rear of the casing permitting access to the sliding plate.

GUST VI-IVAIQTNULA. 

